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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The average adult has about 21 square feet of skin.